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raw | patch | inline | side by side (parent: c0d8dc0)
author | Hal Finkel <hfinkel@anl.gov> | |
Fri, 15 Mar 2013 15:27:13 +0000 (15:27 +0000) | ||
committer | Hal Finkel <hfinkel@anl.gov> | |
Fri, 15 Mar 2013 15:27:13 +0000 (15:27 +0000) |
Unaligned access is supported on PPC for non-vector types, and is generally
more efficient than manually expanding the loads and stores.
A few of the existing test cases were using expanded unaligned loads and stores
to test other features (like load/store with update), and for these test cases,
unaligned access remains disabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177160 91177308-0d34-0410-b5e6-96231b3b80d8
more efficient than manually expanding the loads and stores.
A few of the existing test cases were using expanded unaligned loads and stores
to test other features (like load/store with update), and for these test cases,
unaligned access remains disabled.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177160 91177308-0d34-0410-b5e6-96231b3b80d8
index 13cb358fc028f01dc33fbadb2badc80af1cdc09e..a7e9d56fa9d6b402f9e1f6095989d1e89206176d 100644 (file)
static cl::opt<bool> DisableILPPref("disable-ppc-ilp-pref",
cl::desc("disable setting the node scheduling preference to ILP on PPC"), cl::Hidden);
+static cl::opt<bool> DisablePPCUnaligned("disable-ppc-unaligned",
+cl::desc("disable unaligned load/store generation on PPC"), cl::Hidden);
+
static TargetLoweringObjectFile *CreateTLOF(const PPCTargetMachine &TM) {
if (TM.getSubtargetImpl()->isDarwin())
return new TargetLoweringObjectFileMachO();
}
}
+bool PPCTargetLowering::allowsUnalignedMemoryAccesses(EVT VT,
+ bool *Fast) const {
+ if (DisablePPCUnaligned)
+ return false;
+
+ // PowerPC supports unaligned memory access for simple non-vector types.
+ // Although accessing unaligned addresses is not as efficient as accessing
+ // aligned addresses, it is generally more efficient than manual expansion,
+ // and generally only traps for software emulation when crossing page
+ // boundaries.
+
+ if (!VT.isSimple())
+ return false;
+
+ if (VT.getSimpleVT().isVector())
+ return false;
+
+ if (VT == MVT::ppcf128)
+ return false;
+
+ if (Fast)
+ *Fast = true;
+
+ return true;
+}
+
/// isFMAFasterThanMulAndAdd - Return true if an FMA operation is faster than
/// a pair of mul and add instructions. fmuladd intrinsics will be expanded to
/// FMAs when this method returns true (and FMAs are legal), otherwise fmuladd
index 3931384d8901ba588d2b6cdbef8ed891f341de93..8d44d9ff46b00919892a3357f14f98b8d1a6b726 100644 (file)
bool IsMemset, bool ZeroMemset, bool MemcpyStrSrc,
MachineFunction &MF) const;
+ /// Is unaligned memory access allowed for the given type, and is it fast
+ /// relative to software emulation.
+ virtual bool allowsUnalignedMemoryAccesses(EVT VT, bool *Fast = 0) const;
+
/// isFMAFasterThanMulAndAdd - Return true if an FMA operation is faster than
/// a pair of mul and add instructions. fmuladd intrinsics will be expanded to
/// FMAs when this method returns true (and FMAs are legal), otherwise fmuladd
index 12f1d1f130d86c9b6d41b0c59206accf1785b267..98951306fd8e9ff1418266f4390af2a495d75938 100644 (file)
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
-; RUN: llc < %s | FileCheck %s
+; RUN: llc -disable-ppc-unaligned < %s | FileCheck %s
define fastcc void @allocateSpace(i1 %cond1, i1 %cond2) nounwind {
entry:
index 884d3a89d15aa21aab7fa37fef1a1ce3ee498a81..59b108a8144c696d194cf6edd3e6f0a772bd6018 100644 (file)
-; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim < %s | FileCheck %s
+; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim -disable-ppc-unaligned < %s | FileCheck %s
; FIXME: The code generation for packed structs is very poor because the
; PowerPC target wrongly rejects all unaligned loads. This test case will
index c7cbfa8ee6ace94a2c2b27fd4959d54a3d6633d4..c746039f43543d9d19e8e7c147022a76bb4e1ce8 100644 (file)
-; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim < %s | FileCheck %s
+; RUN: llc -mcpu=pwr7 -O0 -disable-fp-elim -disable-ppc-unaligned < %s | FileCheck %s
; FIXME: The code generation for packed structs is very poor because the
; PowerPC target wrongly rejects all unaligned loads. This test case will
index 897bfc6d6caaf80922e4f5fe2601c68a96e3c60a..e0bd043454396a21635ee9cecd7c8b2ccce4e949 100644 (file)
-; RUN: llc < %s | FileCheck %s
+; RUN: llc -disable-ppc-unaligned < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
diff --git a/test/CodeGen/PowerPC/unaligned.ll b/test/CodeGen/PowerPC/unaligned.ll
--- /dev/null
@@ -0,0 +1,73 @@
+; RUN: llc < %s -mtriple=powerpc64-unknown-linux-gnu -mcpu=pwr7 | FileCheck %s
+target datalayout = "E-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f128:64:128-n32"
+
+define void @foo1(i16* %p, i16* %r) nounwind {
+entry:
+ %v = load i16* %p, align 1
+ store i16 %v, i16* %r, align 1
+ ret void
+
+; CHECK: @foo1
+; CHECK: lhz
+; CHECK: sth
+}
+
+define void @foo2(i32* %p, i32* %r) nounwind {
+entry:
+ %v = load i32* %p, align 1
+ store i32 %v, i32* %r, align 1
+ ret void
+
+; CHECK: @foo2
+; CHECK: lwz
+; CHECK: stw
+}
+
+define void @foo3(i64* %p, i64* %r) nounwind {
+entry:
+ %v = load i64* %p, align 1
+ store i64 %v, i64* %r, align 1
+ ret void
+
+; CHECK: @foo3
+; CHECK: ld
+; CHECK: std
+}
+
+define void @foo4(float* %p, float* %r) nounwind {
+entry:
+ %v = load float* %p, align 1
+ store float %v, float* %r, align 1
+ ret void
+
+; CHECK: @foo4
+; CHECK: lfs
+; CHECK: stfs
+}
+
+define void @foo5(double* %p, double* %r) nounwind {
+entry:
+ %v = load double* %p, align 1
+ store double %v, double* %r, align 1
+ ret void
+
+; CHECK: @foo5
+; CHECK: lfd
+; CHECK: stfd
+}
+
+define void @foo6(<4 x float>* %p, <4 x float>* %r) nounwind {
+entry:
+ %v = load <4 x float>* %p, align 1
+ store <4 x float> %v, <4 x float>* %r, align 1
+ ret void
+
+; These loads and stores are legalized into aligned loads and stores
+; using aligned stack slots.
+; CHECK: @foo6
+; CHECK: ld
+; CHECK: ld
+; CHECK: std
+; CHECK: std
+}
+